IN THE CAIINIVOIIOUS DINOCEPHALIAN IlurTlLES. 



681 



in the Anoinodont jaw concerning which opinions have differed 

 which must first be cleared up, and of these the most important 

 is the presence or absence of a coronoid. In 1910 I stated: 

 "There is no coronoid process and no cox'onoid bone." In 1912 

 Watson, in his interesting paper on Reptilian lower jaws, 

 describes the coronoid as "a thin slip of bone lying on the inner 

 face of the denta.ry, separated from it and the splenial by very 

 distinct sutures in several specimens, and apparently just entering 

 the symphysis." And in his figui-e of the inside of the jaw he 

 shows what he regards as the coronoid. Two years later he 

 expressed some doubts about the coronoid, and stated : " I have 

 never been able to see a clear distinction of the bones in section, 

 and the apparent suture is, perhaps, something else." In 1914 

 von Hoepen gave by far the best account of the Anomodont jaw 

 that has yet appeared. He paid minute attention to the question 

 of the presence or absence of a coronoid, and gives his conclusion 



Text-figure 14. 



Right mandible of the Anomodont Kannemeijeria simocejiJialus (Wicthofer). 



very emphatically : " I can therefore definitely state that the 

 alleged coronoidal element between the deutary and the comple- 

 mentary does not exist in Lystrosaurus nor in Dici/noclon.^' 

 Sollas and SoUas in 1913 also stated that they could "find no 

 trace " of a coronoid. The matter might have been left as settled 

 that there is no coronoid, but unfortunately the deservedly great 

 weight of Watson's authority has resulted in his opinion being 

 accepted by Abel, and his figure of the Dicynodon jaw, showing 

 the supposed coronoid, being reproduced in 'Die Stiimme der 

 Wirbeltiere.' 



In view of the difierence of opinion it may not be regarded as 

 superfluous to give two new drawings of the Dicynodont jaw and 

 a couple of views of the jaw of EndotJiiodon. 



The jaAv of Kannemeyeria, like all Dicynodont jaws, shows the 

 peculiar development of the angular. If the inner part of the 

 angular had an upper development against the sui'angular which 



